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xen-ia64-devel
Re: [Xen-ia64-devel] domU stability
On Tue, Nov 15, 2005 at 06:50:20AM -0800, Magenheimer, Dan (HP Labs Fort
Collins) wrote:
> > >From: Tristan Gingold
> > >
> > >I am trying xen-ia64-unstable.hg using changeset 7729. Dom0
> > works well.
> > >However, domU seems pretty unstable: I got a lot of bad mpa:
> > >However, I was able to log on domU (after many tries).
> > >Has any of you the same errors or is it ok ?
> >
> > Hi, Tristan,
> > That warning is harmless, and currently the grant table
> > pfn is hard code at 0x10000000000 in guest physical, which is
> > out of normal guest memory range. When be/fe driver
> > communicates, grant table entries are touched and then you
> > saw above warnings.
>
> They do not seem to cause any problems but
> I'm not entirely sure they are harmless. I think these addresses
> are domU grant table entries that should be translated to
> virtual addresses and shouldn't find their way to
> translate_domain_pte.
>
> Matt, can you comment?
Yes, as Kevin explains, this is how it's meant to work - the
grant table is currently mapped into guest physical space at
that address, above the top of normal guest physical memory.
Even if the guest kernel access it through a virtual mapping,
the translation process still goes through translate_domain_pte
and hence results in that warning (which should be harmless).
Matt
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